Two examples of the exercises with the apparatus for visual discrimination of dimensional gradations. Note the intentional movement of the hands and the attitude revealing total concen- tration of mind and body. The careful scrutiny is a clear mani- festation of the child's desire for perfection. Top: Montessori School, Adyar, Madras, India. Photo by C. T. Nachiappan. Bottom: Photo taken in an English Montessori School by Mrs. V. A. Baker.